Watch a replay of the Delta 4 NROL-47 launch

A $1.1 billion science investigation involving four formation-flying satellites circling the Earth will share a single Atlas 5 rocket launch Thursday night from Cape Canaveral to probe explosions in the magnetic field with millisecond speed.

Launch startup Relativity Space has won approval from the U.S. Air Force to take over a disused launch pad at Cape Canaveral for the company’s methane-fueled Terran 1 rocket, a 3D-printed launcher that could carry small satellites into orbit by the end of 2020.

A sophisticated combat-ready U.S. military missile warning satellite moved to its launch pad at Cape Canaveral Space Force Station Saturday on top of a United Launch Alliance Atlas 5 rocket, ready for liftoff Monday afternoon.